Network Rendering textures
Yes, there is.

You need to pack the external data.

It's simple!


Click file, in the info panel.
Select External data.
Press Pack All Into .blend.


Or you can simply check Automatically Pack Into .blend so that it will automatically save the external data (like images) into the blend file.

Note: this will make your blend file larger. You may not want to do this for every revision, otherwise your file sizes will quickly stack up, because each file will store the images.



About motion blur in network rendering, I don't think that feature is supported yet. However you can try the experimental feature set, and I think it may be enabled, just not "stable". I'm not sure whether they have it there or not though.



Final note.

To pack a single image, in the image editor select "image", "pack as PNG".